Production of the O 5+(1s2s2p 4P J) states by electron excitation in 10–34 MeV collisions of O 5+ ions with H 2, He, Ne, Ar, Kr and Xe targets

Abstract

Absolute double differential cross sections (DDCS) for electron production were determined for the Auger-decay of the (1s2s2sp 4P) state in 10–34 MeV collisions of O 5+(1s 22s) ions with H 2, He, Ne, Ar, Kr, Xe targets using zero-degree projectile Auger-electron spectroscopy. Due to spin conservation, e-n interaction mechanisms are excluded to first order and thus the e-e interaction is expected to dominate the (1s 22s 2S) a ̊ (1s2s2p 4P) excitation. Auger electrons from the decay of the O 5+(1s2s2p 4P) state to the O 6+(1s 2) ground state were observed. The electron scattering model, using calculated direct electron-ion impact excitation cross sections, was compared to the measured DDCS. These calculations included the effects of the alignment of the 4P J ( J = 1 2 , 3 2 , 5 2 ) states and their subsequent angular-dependent Auger electron emission.